TABLE 2.

Frequency of WBi results with different cohorts from different territories

Country or regionCohortPopulation total (n)No. screen positive (no. negative)No. of WBi results (%)Reference
United StatesBlood donor500,0001,100160 (14.5) 80
United StatesBlood donor3,270,0002,6601,207 (45.4) 27
PeruGeneral population1,3633513 (37.1) 19
ChileDonor and risk group600,0004,956409 (8.3) 68
IndiaBlood donor39,784445 (11.4) 92
NigeriaBlood donor50018655 (29.6) 28
EthiopiaVolunteersa12,1241,437 (1,475)c91 (6.3)/31 (2.1)c,e 57
BrazilRejected donorNAb210d6 (2.9) 4
Central AfricaHigh-risk group1,9981,065367 (34.5) 5
United StatesHigh-risk groupNA371123 (33.2) 96
United StatesOther disordersNA19973 (36.7) 96
Saudi ArabiaHospital/health center cohortsNA2,849444 (15.6) 39
BrazilPregnant women9,78610511 (10.5) 21
CameroonPregnant women85916313 (8.0) 33
  • a Participants in Ethio-Netherlands AIDS Research Project.

  • b NA, not available.

  • c Only 1,475 of the 10,687 screened negative were included in Western blot testing.

  • d Selected cohort; no association was made with the initial population screened.

  • e The two values are number of WBi results among those who screened positive/number of WBi results among those who screened negative, with percentages for each given parenthetically.